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12
5.
Do not install under a deck.
6.
Do not install within 24" of any outdoor
HVAC equipment.
7.
Do not install where water may run-off a
roof into the heater. A gutter may be need-
ed to protect the heater.
8.
Any enclosure around the heater must
provide a combustion air vent commenc-
ing within 12 inches of the bottom of the
enclosure. The vent opening shall have
a minimum free area of 1 square inch per
4,000 btu/hr input rating of all gas appliances in the enclosure. See Table 5.
9. If the heater is to be installed in front of an exterior wall with with vinyl siding, increase the clearance
from the back of the unit shown in Table 2 to 12 inches.
10. For minimum exhaust vent clearances for all building openings, including but not limited to vented
eaves, doors, windows, or gravity inlets, see Figure 3. In Canada, the heater must be installed with
the top of the vent at least 10 feet (3m) below, or to either side of, any opening into a building.
Figure 3: Minimum Clearances
4
Minimum
3
ft
Minimum
Forced Air Inlet
4
ft
Minimum
ft
10
ft
Minimum
Table 2
Outdoor Installation Clearances
Heater Panel
Top
Front
Back
Water Connection Side
Side Opposite Water
Connection
4
ft
Minimum
Required Clearance
Unobstructed
24 inches
6 inches
12 inches
6 inches
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